There’s a wonderful quote about Heath Ledger’s performance as The Joker, as well as his demeanor on set:

He was incredibly intense in his performance but incredibly mellow and laid-back. Certainly there was this great anarchistic streak to it—just getting dirtier than anybody’s envisioned The Joker before. This character has power because he has no limits—absolutely nothing to lose.

Details is on stands now, and The Dark Knight will be in theaters on July 18th.